Composite ceramic rod for casting forming of hollow single crystal blade top cover hole, manufacturing method and application

Abstract

The invention discloses a composite ceramic rod for casting forming of a hollow single crystal blade top cover hole, the composite ceramic rod comprises a core part, a transition layer and an outer layer, the core part is a ceramic rod, the transition layer is a ceramic core matrix material wrapping the outer side of the core part, and the outer layer is a SiO2 material wrapping the outer side of the transition layer; the invention further discloses a manufacturing method and application. The manufacturing method comprises the following steps: putting the ceramic rod into the quartz glass tube; injecting the ceramic core matrix slurry into a gap between the ceramic rod and the quartz glass tube to obtain a composite material blank of which the outer layer is the quartz glass tube, the interlayer is the ceramic core matrix slurry and the core part is the ceramic rod; sintering and molding; cutting to obtain a composite ceramic rod; the outer-layer quartz glass tube, the core ceramic rod and the transition-layer ceramic core base body are subjected to mold injection and high-temperature sintering to form the composite ceramic rod, and the composite ceramic rod has excellent high-temperature strength and excellent removability; and the mold core is well matched with an existing ceramic mold core manufacturing process and an existing ceramic mold core casting process, and additional equipment does not need to be added during later removal.

Description

technical field [0001] The invention relates to the technical field of ceramic composite material casting, in particular to a composite ceramic rod for casting molding of a top cover hole of a hollow single crystal blade, a manufacturing method and an application thereof. Background technique [0002] As the machine with the most complex structure, the harshest working conditions and the highest safety requirements in the world, the aero-engine is known as the crown jewel in its manufacturing technology, and the single-crystal turbine, which is the core component of the fourth and fifth-generation aero-engines, works The manufacturing technology of the blade is known as the brightest jewel in the crown. With the improvement of the performance requirements of aero-engines, the temperature-bearing capacity of the materials used in the single-crystal turbine working blades is getting higher and higher. Correspondingly, the casting temperature of the blades is getting higher and...

AI Technical Summary

Problems solved by technology

With the improvement of the performance requirements of aero-engines, the temperature-bearing capacity of the materials used in the single-crystal turbine working blades is getting higher and higher. Correspondingly, the casting temperature of the blades is getting higher and higher, and the inner cavity structure is becoming more and more complex. At present, The casting temperature of blades molded by second-generation single crystal alloy casting has reached above 1500°C, and the diameter of the roof hole of some single crystal blades has been reduced to less than 1mm. Traditional turbine blade top cover hole casting molding materials use quartz rods, which can no longer meet the demand

The traditional casting method is to pre-embed quartz glass rods in ceramic cores, but at high temperatures above 1500°C and structures as small as 1mm in diameter, the strength of the quartz glass rods is insufficient and easy to break and deform. Al 2 o 3 or Zr 2 o 3 , there is a problem of difficulty in later removal

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